AUDIO AND VISUAL SYSTEM > Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter

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DESCRIPTION

The stereo component amplifier's Auto Sound Levelizer (ASL) adjusts the audio volume in accordance with vehicle noise. For example, when vehicle noise increases, the ASL automatically increases the audio's volume. The ASL uses speed signals from the combination meter.

WIRING DIAGRAM


E108025E02


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - COMBINATION METER)


    E109065E02

  1. Disconnect the V29 stereo component amplifier and L31 combination meter assembly connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    V29-11 (SPD) - L31-9 (+S)
    		Always
    		Below 1 Ω
    V29-11 (SPD) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


2.CHECK COMBINATION METER ASSEMBLY


    E108085E03

  1. Jack up either of the rear wheels.

  1. Move the shift lever to the neutral position.

  1. Measure the voltage between the terminal +S and body ground while turning the jacked up rear wheel slowly.

    Standard voltage:
    Tester Connection
    		Condition
    		Specification
    L31-9 (+S) - Body ground
    		Turning jacked up wheel slowly
    		Voltage is pulsed



NG
CHECK COMBINATION METER SYSTEM
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE